scholarly journals PBTrust: A Priority-Based Trust Model for Service Selection in General Service-Oriented Environments

2010 ◽  
Author(s):  
Xing Su ◽  
Minjie Zhang ◽  
Yi Mu ◽  
Kwang Mong Sim
Keyword(s):  
Service Selection ◽  
Trust Model ◽  
Service Oriented ◽  
A Priority ◽  
General Service

Trust Based Service Selection in Service Oriented Environment

2012 ◽  
Vol 9 (3) ◽  
pp. 23-42 ◽  
Author(s):  
Jun Li ◽  
Xiaolin Zheng ◽  
Deren Chen ◽  
William Wei Song
Keyword(s):  
Service Selection ◽  
Trust Model ◽  
Specific Service ◽  
Computational Trust ◽  
Direct Trust ◽  
Global Quality ◽  
The Social ◽  
Service Oriented ◽  
Sparse Networks ◽  
Malicious Behaviors

In a service-oriented environment, it is inevitable and indeed quite common to deal with web services, whose reliability is unknown to the users. The reputation system is a popular technique currently used for providing a global quality score of a service provider to requesters. However, such global information is far from sufficient for service requesters to choose the most qualified services. In order to tackle this problem, the authors present a trust based architecture containing a computational trust model for quantifying and comparing the trustworthiness of services. In this trust model, they firstly construct a network based on the direct trust relations between participants and rating similarity in service oriented environments, then propose an algorithm for propagating trust in the social network based environment which can produce personalized trust information for a specific service requester, and finally implement the trust model and simulate various malicious behaviors in not only dense but also sparse networks which can verify the attack-resistant and robustness of the proposed approach. The experiment results also demonstrate the feasibility and benefit of the approach.

A Two Phases Self-healing Framework for Service-oriented Systems

2021 ◽  
Vol 15 (2) ◽  
pp. 1-25
Author(s):  
Amal Alhosban ◽  
Zaki Malik ◽  
Khayyam Hashmi ◽  
Brahim Medjahed ◽  
Hassan Al-Ababneh
Keyword(s):  
Web Services ◽  
A Priori ◽  
Fault Management ◽  
Service Selection ◽  
Exception Handling ◽  
Self Healing ◽  
Service Oriented Architectures ◽  
Service Oriented ◽  
Improved Performance ◽  
High Level

Service-Oriented Architectures (SOA) enable the automatic creation of business applications from independently developed and deployed Web services. As Web services are inherently a priori unknown, how to deliver reliable Web services compositions is a significant and challenging problem. Services involved in an SOA often do not operate under a single processing environment and need to communicate using different protocols over a network. Under such conditions, designing a fault management system that is both efficient and extensible is a challenging task. In this article, we propose SFSS, a self-healing framework for SOA fault management. SFSS is predicting, identifying, and solving faults in SOAs. In SFSS, we identified a set of high-level exception handling strategies based on the QoS performances of different component services and the preferences articled by the service consumers. Multiple recovery plans are generated and evaluated according to the performance of the selected component services, and then we execute the best recovery plan. We assess the overall user dependence (i.e., the service is independent of other services) using the generated plan and the available invocation information of the component services. Due to the experiment results, the given technique enhances the service selection quality by choosing the services that have the highest score and betters the overall system performance. The experiment results indicate the applicability of SFSS and show improved performance in comparison to similar approaches.

Modelling Self-Led Trust Value Management in Grid and Service Oriented Infrastructures

2012 ◽  
pp. 122-139
Author(s):  
Antony Brown ◽  
Paul Sant ◽  
Nik Bessis ◽  
Tim French ◽  
Carsten Maple
Keyword(s):  
Trust Management ◽  
Large Scale ◽  
Ad Hoc ◽  
Trust Model ◽  
Management Decision ◽  
Value Management ◽  
Trust Value ◽  
Graph Theoretic ◽  
Collaborative Environment ◽  
Service Oriented

Current developments in grid and service oriented technologies involve fluid and dynamic, ad hoc based interactions between delegates, which in turn, serves to challenge conventional centralised structured trust and security assurance approaches. Delegates ranging from individuals to large-scale VO (Virtual Organisations) require the establishment of trust across all parties as a prerequisite for trusted and meaningful e-collaboration. In this paper, a notable obstacle, namely how such delegates (modelled as nodes) operating within complex collaborative environment spaces can best evaluate in context to optimally and dynamically select the most trustworthy ad hoc based resource/service for e-consumption. A number of aggregated service case scenarios are herein employed in order to consider the manner in which virtual consumers and provider ad hoc based communities converge. In this paper, the authors take the view that the use of graph-theoretic modelling naturally leads to a self-led trust management decision based approach in which delegates are continuously informed of relevant up-to-date trust levels. This will lead to an increased confidence level, which trustful service delegation can occur. The key notion is of a self-led trust model that is suited to an inherently low latency, decentralised trust security paradigm.

scholarly journals Service selection in service oriented architecture using probabilistic approach and asynchronous queues with interceptor validation

2020 ◽  
Vol 10 (1) ◽  
pp. 396
Author(s):  
Balika J. Chelliah ◽  
K. Sathish ◽  
S. Arun Kumar
Keyword(s):  
Queue Length ◽  
Service Oriented Architecture ◽  
Probabilistic Approach ◽  
Service Selection ◽  
Mass Function ◽  
Quality Parameters ◽  
Selection Strategy ◽  
Probability Mass Function ◽  
Service Oriented ◽  
Probability Mass

In service Oriented Architecture, many services are offered with similar functionality but with different service quality parameters. Thus the service selection using a deterministic approach causes conflicts and inefficient results. We use asynchronous queue to model the service inventory architecture avoiding unnecessary locking of resources and thus allowing a provision to consumers to get their required services without intervening and with temporally decoupled fashion. Actually this kind of service selection strategy is considered in regards with game theory to eliminate fluctuations of queue length. It offers a discrete random service which is equal to some request requested by consumers, it means service can be provided based on probability mass function as a substitute of deterministic decisions for selecting a proper service provider as of the consumers. Once the request is taken out from the queue, it is delivered to the interceptor that has validation and sanitization module. It thus reduces the peak queue length and reduces periodic fluctuations in the queue length.

Large-scale Performance Evaluation of e-Homecare Architectures Using the WS-NS Simulator

2011 ◽  
Vol 50 (05) ◽  
pp. 408-419 ◽  
Author(s):  
B. Volckaert ◽  
B. Dhoedt ◽  
F. De Turck ◽  
S. Van Hoecke
Keyword(s):  
Large Scale ◽  
Response Times ◽  
Service Selection ◽  
Network Simulator ◽  
Service Oriented Architectures ◽  
Selection Strategies ◽  
Service Oriented ◽  
Multiple Sclerosis Patients ◽  
Time Critical ◽  
Selection Algorithms

SummaryBackground: E-homecare creates opportunities to provide care faster, at lower cost and higher levels of convenience for patients. As e-homecare services are time-critical, stringent requirements are imposed in terms of total response time and reliability, this way requiring a characterization of their network load and usage behavior. However, it is usually hard to build testbeds on a realistic scale in order to evaluate large-scale e-home-care applications.Objective: This paper describes the design and evaluation of the Network Simulator for Web Services (WS-NS), an NS2-based simulator capable of accurately modeling service-oriented architectures that can be used to evaluate the performance of e-homecare architectures.Methods: WS-NS is applied to the Coplintho e-homecare use case, based on the results of the field trial prototype which targeted diabetes and multiple sclerosis patients. Network-unaware and network-aware service selection algorithms are presented and their performance is tested.Results: The results show that when selecting a service to execute the request, suboptimal decisions can be made when selection is solely based on the service’s properties and status. Taking into account the network links interconnecting the services leads to better selection strategies. Based on the results, the e-homecare broker design is optimized from a centralized design to a hierarchical region-based design, resulting in an important decrease of average response times.Conclusions: The WS-NS simulator can be used to analyze the load and response times of large-scale e-homecare architectures. An optimization of the e-homecare architecture of the Coplintho project resulted in optimized network overhead and more than 45% lower response times.

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